Widely used Cisco UC apps; unauthenticated RCE leading to root; actively exploited per CISA KEV.
CVE-2026-20045
Unauthenticated remote code execution and root privilege escalation in Cisco UC products via HTTP.
Is CVE-2026-20045 being exploited?
Yes. CVE-2026-20045 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2026-20045?
CVE-2026-20045 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-20045?
Yes. A fix has been recorded for CVE-2026-20045. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-20045 affect?
CVE-2026-20045 affects Cisco Unified Communications Manager (CUCM), CUCM Session Management Edition (SME), CUCM IM&P, Cisco Unity Connection, and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-20045?
Apply patches per Cisco advisory; upgrade affected devices.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can execute OS commands, gain user access, and escalate to root.
Immediate action required
- affected12.5(1)SU2
- affected12.5(1)SU1
- affected12.5(1)
- affected12.5(1)SU3
- affected12.5(1)SU4
- affected14
- affected12.5(1)SU5
- affected14SU1
- affected12.5(1)SU6
- affected14SU2
- affected12.5(1)SU7
- affected12.5(1)SU7a
- affected14SU3
- affected12.5(1)SU8
- affected12.5(1)SU8a
- affected15
- affected15SU1
- affected14SU4
- affected14SU4a
- affected15SU1a
- affected12.5(1)SU9
- affected15SU2
- affected15.0.1.13010-1
- affected15.0.1.13011-1
- affected15.0.1.13012-1
- affected15.0.1.13013-1
- affected15.0.1.13014-1
- affected15.0.1.13015-1
- affected15.0.1.13016-1
- affected15.0.1.13017-1
- affected15SU3a
- affected12.5(1)
- affected12.5(1)SU1
- affected12.5(1)SU2
- affected12.5(1)SU3
- affected12.5(1)SU4
- affected14
- affected12.5(1)SU5
- affected14SU1
- affected12.5(1)SU6
- affected14SU2
- affected14SU2a
- affected12.5(1)SU7
- affected14SU3
- affected12.5(1)SU8
- affected15
- affected15SU1
- affected14SU4
- affected12.5(1)SU9
- affected15SU2
- affected15SU3
- affected12.5(1)
- affected12.5(1)SU1
- affected12.5(1)SU2
- affected12.5(1)SU3
- affected12.5(1)SU4
- affected14
- affected12.5(1)SU5
- affected14SU1
- affected12.5(1)SU6
- affected14SU2
- affected12.5(1)SU7
- affected14SU3
- affected12.5(1)SU8
- affected14SU3a
- affected12.5(1)SU8a
- affected15
- affected15SU1
- affected14SU4
- affected12.5(1)SU9
- affected15SU2
- affected15SU3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.